Blooregard Quornwell Kazoo also known as Bloo for short, is one of the main protagonist in Foster's Home for Imaginary Friends, voiced by Keith Ferguson. Mac created Bloo when he was three years old, meaning that, by the start of the series, they had been creator and creation for five years. Bloo is, at the core of his personality, a clever,selfish, narcissistic maniac. Series creator Craig McCracken has said in an interview that the character was based on his childhood prior to the death of his father at the age of seven. Bloo is abrasive, trouble-making, immature, jealous, and manipulative, partially due to his restless energy, cleverness, and delusional narcissism. When first introduced, Bloo was shown to have a slightly more gentle personality, kind to everyone and willing to protect his creator and best friend Mac. However, somewhat quickly, his personality shifted considerably. Bloo developed a rather quirky personality and has often proclaimed himself to be "the best imaginary friend ever." This was in jeapordy when Uncle Pockets visited. He has often demonstrated a hyper, albeit nonchalant personality and is sometimes incredibly naïve and childish. Bloo often has a tendency to accept outrageous ideas as fact to explain seemingly mundane occurrences., and bends others to his will, going so far as to make them go against their moral standards. Bloo also displays a passion for paddleball, although he never succeeds in making the ball hitting the paddle, to which he insists that all his paddles are broken. There are times when Bloo's cleverness is muted, however. He sometimes can be tricked by rather simple appearances. Occasionally, his thoughts tend toward the bizarre, going as far as paranoia. Lessons in the form of metaphors are lost on him. His cleverness also has limits when he is distracted. Bloo often disregards the rules or finds loopholes in them easily, and sees rules as only obstacles preventing him from having fun. Bloo and Mac are usually the ones at the receiving end of the episode's morality tale (Mostly Bloo), usually because Bloo's antics got them there in the first place. Bloo is always making mischief in the house. In the course of the show, he has committed a number of crimes and indiscretions such as cheating, stealing, vandalism, destruction of property, evading arrest, and even causing an imaginary friend at Foster's to be deported by framing him for one of his pranks. Bloo has apparently been actually arrested at one point or another; he knows the security guard by his first name and that he has children.

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